Jalal Uddin, 64, was found with head injuries in a children's play area in Rochdale, Greater Manchester, on February 18.

He was taken to hospital but died a short time later.

It has previously been reported that Mr Uddin, a former imam, had made efforts to turn youngsters away from radical Islam.

Counter-terrorism officers were brought in to lead the investigation last month after the discovery of material linked to Islamic State during a series of raids.

The scene at a children's playground in Wardleworth, Rochdale

Police have now revealed a 24-year-old man has been arrested on suspicion of arranging funds for terrorism.

A 28-year-old man has been held on suspicion of conspiracy to commit murder, while a third man, aged 21, was also being further questioned on suspicion of conspiracy to commit murder after he answered bail.

Assistant Chief Constable Rebekah Sutcliffe, of Greater Manchester Police, said: "The investigation into Jalal's murder has so far been a far-reaching and diligent process with a team of officers working meticulously to examine every lead that has come to light.

"We are continuing to make good strides in the investigation which would not be possible without the understanding and support of members of the public and I would like to thank them for their patience whilst we work through our inquiries.

"The investigation remains very much active and we are continuing to appeal to anyone who may have information that they believe can assist us to please contact police."